/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package locking;

import org.apache.curator.utils.CloseableUtils;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.apache.curator.test.TestingServer;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

public class LockingExample {
	private static final int QTY = 5;
	private static final int REPETITIONS = QTY * 10;

	private static final String PATH = "/examples/locks";

	public static void main(String[] args) throws Exception {
		// all of the useful sample code is in ExampleClientThatLocks.java

		// FakeLimitedResource simulates some external resource that can only be
		// access by one process at a time
		final FakeLimitedResource resource = new FakeLimitedResource();

		ExecutorService service = Executors.newFixedThreadPool(QTY);
		final TestingServer server = new TestingServer();
		try {
			for (int i = 0; i < QTY; ++i) {
				final int index = i;
				Callable<Void> task = new Callable<Void>() {
					@Override
					public Void call() throws Exception {
						CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(),
								new ExponentialBackoffRetry(1000, 3));
						try {
							client.start();

							ExampleClientThatLocks example = new ExampleClientThatLocks(client, PATH, resource,
									"Client " + index);
							for (int j = 0; j < REPETITIONS; ++j) {
								example.doWork(10, TimeUnit.SECONDS);
							}
						} catch (InterruptedException e) {
							Thread.currentThread().interrupt();
						} catch (Exception e) {
							e.printStackTrace();
							// log or do something
						} finally {
							CloseableUtils.closeQuietly(client);
						}
						return null;
					}
				};
				service.submit(task);
			}

			service.shutdown();
			service.awaitTermination(10, TimeUnit.MINUTES);
		} finally {
			CloseableUtils.closeQuietly(server);
		}
	}
}
